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RFI - Stormwater Management Plan
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Original PDF page 32, section 1. The text section number identifies this passage in the reader.
RUNOFF CALCULATIONS EXTERNAL UPSTREAM LOT 1 Macquarie Lodge = 5354m2 Impervious area = 3010m2 (56.2%) assume 70% QUDM Pervious area = 2344m2 LOT 2 Petrie Mansions = 4279m2 Impervious area = 2930m2 (68.5%) assume 70% QUDM Pervious area = 1349m2 LOT 3 Elendra = 2985m2 CATCHMENT TO RIP'S - NOT INCLUDED Impervious area = 2575m2 (86.3%) assume 0.9% Pervious area = 410m2 SERENITY CLOSE (includes portion of banksia ave) = 6101m2 Roadway = 3374m2 (55.3%) assume 0.6% Verge/landscape median (includes footpath) = 2727m2 TOTAL AREA TO EX/1 (IMPERVIOUS AREAS FROM LOTS ONLY + ALL ROAD AREA) = 3010 + 2930 + 6101 = 12041m2 Q10 = Q= 1/360 * (1.0) * 226mm/hr * 1.2041Ha = 0.756m3/s Q100 = Q= 1/360 * (1.0) * 332mm/hr * 1.2041Ha = 1.110m3/s VEGETATION AREA CATCHMENT AREA = 0.404Ha 10% - IMPERVIOUS PAVEMENT (C10 = 0.9) 90% - PERVIOUS DENSE-MEDIUM BUSHLAND WITH HIGH SOIL PERMEABILITY (C10 = 0.25) IMPERVIOUS PORTION CALC q10 = 226mm/hr*(0.404*0.1)*(1.0*0.9)*(1/360) = 0.0228m3/s q100 = 332mm/hr*(0.404*0.1)*(1.2*0.9)*(1/360) = 0.037m3/s PERVIOUS PORTION CALC q10 = 226mm/hr*(0.404*0.9)*(1.0*0.25)*(1/360) = 0.057m3/s q100 = 332mm/hr*(0.404*0.9)*(1.2*0.25)*(1/360) = 0.101m3/s TOTAL CALC q10 = 0.08m3/s q100 = 0.138m3/s
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